ShareThis link shows but nothing inside the box when clicked

Hi,

I recently discovered ShareThis and installed it on both a new site and a site that I've had for 2 years. Both are Drupal 6, though one is 6.6 and the other 6.4 (The problem site) And on the new site, ShareThis displays properly, but on the old site, the link shows, the box shows and looks like it is connecting, then....nothing...empty box... Is this an error on my part, or a something with ShareThis reacting to my site?

This is how it renders on the page:

<script type="text/javascript">
                SHARETHIS.addEntry({
                title:'',
                url:'http://www.bignyc.org/frontpage',
                }, {button:true} );
                </script>

Are the any other modules I need to watch out for that may cause conflicts? Thanks for your help!